详解vueelementplus多语言切换

npm i vue-i18n --save

const EN = {
  login: {
    title: 'User Login'
  },
}
export default  EN

const PL_PL = {
  login: {
    title: 'Użytkownik jest zaloGowany'
  },
}
export default  PL_PL

const ZH_CN = {
  login: {
    title: '用户登录'
  },
}
export default  ZH_CN

import { createI18n } from 'vue-i18n/index'
import 'dayjs/locale/zh-cn'
import zh from './zh-cn'
import en from './en'
import pl from './pl-pl'
const messages = {
  'zh-cn': zh,
  'en': en,
  'pl': pl
}
// Gets the current locale
export function getLanguage() {
  // Use the language of choice 
  const chooselang = localStorage.getItem('locale')
  if (chooselang) return chooselang
  // if not shoose language
  const lang = (navigator.language || navigator.browserLanguage).toLowerCase()
  const locales = Object.keys(messages)
  return locales.includes(lang) ? lang : 'zh-cn'
}
const i18n = createI18n({
  locale: getLanguage(),
  fallbackLocale: 'en',
  global: true,
  messages
})
export function $t(args) {
  return i18n.global.tc(args)
}
console.log($t('login.title'))
export default (app) => {
  app.use(i18n)
}

import language, { getLanguage, $t } from './language'
language(app)

<template>
    //1. 
	<div class="login clamp ta-c fs-28 fw-b m-b10">{{ $t('login.title') }}</div>
	//2.
	<el-input v-model="$t('login.title')"></el-input>
</template>

// ----------------------- state -----------------------------
import { getLanguage } from '@/language'
const state = {
  lang: getLanguage()
}
export default state
// ----------------------- mutations-----------------------------
import * as Types from './types'
import locale from 'element-plus/lib/locale'
import localeZH from 'element-plus/lib/locale/lang/zh-cn'
import localeEN from 'element-plus/lib/locale/lang/en'
import localePL from 'element-plus/lib/locale/lang/pl'
const element = {
  'zh-cn': localeZH,
  'en': localeEN,
  'pl': localePL
}
const mutations = {
  // 切换语言
  [Types.SET_LANG](state, lang) {
    state.lang = lang
    localStorage.setItem('locale', lang)
    locale.use(element[lang])
  }
}
export default mutations
// ----------------------- types-----------------------------
export const SET_LANG = 'SET_LANG'

import * as Types from '@/store/types'
import { useI18n } from "vue-i18n";
export default {
  setup(props,ctx) {
    const { locale: lang } = useI18n({ useScope: "global" })
    let store = useStore()
    const handelLanguage = (name) => {
      lang.value = name
      store.commit(Types.SET_LANG, name)
    }
    return {
      handelLanguage
    }
  }
}

// ----------------------- template-----------------------------
<router-view v-if="isReloadRouter"/>
// ----------------------- script-----------------------------
const reload = () => {
	 state.isReloadRouter = false
     nextTick(() => {
       state.isReloadRouter = true
     })
}
provide("reload", reload)
<-- 自行引入 provide nextTick ->

 const handelLanguage = (name) => {
      lang.value = name
      store.commit(Types.SET_LANG, name)
      inject('reload')()
    }

import language, { getLanguage, $t } from './language'
import '@/styles/elementDefault.sCSS'
store.commit(Types.SET_LANG, getLanguage())

import language, { getLanguage, $t } from './language'
const app = createApp(App);
// ----------------------- app.config.globalProperties -----------------------------
app.config.globalProperties.$t = $t
// 使用
import { getCurrentInstance } from 'vue'
const { proxy } = getCurrentInstance()
proxy.$t()
// ----------------------- provide、inject -----------------------------
// main.js中
app.provide('$t', $t)
// 使用
const $t = inject('$t')
ElMessage.warning({
  message: $t('login.warnMessage'),
   type: 'warning'
 });

import { $t } from '@/language'
{
        path: '/mainManage/device',
        name: 'device',
        hidden: false,
        meta: { icon: 'circle', title: $t('router.device') },
        component: () =>
          import( '@/views/mainManage/device')
      },